I've got SW Motech 1" up and 1" back risers... Very pleased with the construction.
No problem w/ the cables, *however*:
1- I have +2" braided steel brake lines from AdventureTech (Gaffer)
2- I also lowered the bike (both rear and front end). That also adds just a bit of cable slack by bringing the bars a bit lower...
All that said, I don't believe adding the up and back risers would be a cable problem with the stock lines, if you release or stretch just one or two of the routing clips.
2017 Pearl White 650[/B]
AdventureTech lowering links and GPS mount
AdventureTech +2" SS braided brake line
GPI spools, SW Motech risers
Givi XS307 Tanklock bag and Givi 46L top case
Suzuki hard case saddlebags